Induction-coil



R- ROSNER.

' INDUCTION COIL.

APPLIcArloN FILED FEB. 23. 191e.

'1 ,332,757 Patented Mar. 2.1920

any Innung l UNITED STATES PATENT FFICE.

RUDOLF ROSNER, 0F CHICAGQ, ILLINOIS, ASSIGNOB. T0CARTERI|ONG MAG-NETO' COMPANY, 0F WAUKEGAN, ILLINOIS, A CORPORATION OF ILLINOIS.

iNDUcTIoN-GOIL.

Specification of Letters .'Patent.

Application led February 23, 1918. Serial No. 218,876.

To all whom t may concern:

Be it known that I, RUDOLF RosNnR, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certa1n new and useful Improvements in Induction Coils, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention 1s to provide an improved construction of secondary or induction coils. It consists in the elements and features of construction shown and descr'ibed, as indicated in the claims.

In the drawings:

Figure l is an axial section of an inductorium or induction coil embodying this inven- Fig. 2 is a section at the line, 2--2, on. Fig. 1.

Fig. 3 is a perspective v1ew of one oflthe core strips characteristic of the invention, the same being shown somewhat exaggerated in thickness. i

- In the structure shown in the drawings, A and B, are two concentric tubes of suitable dielectric material whose annular interspace contains the core of the induction coil, which consists of a multiplicity .of thin flat soft iron strips, C, each completely coated as to all sides and ends with insulations such, for example, as a film of linseed oil, so as to aii'ord eii'ectiye insulation with the least sacri'ce of space, and permit the largest possible mass of soft iron core within the given space. The entire group of soft iron strips, C, is embedded in suitable insulations such as, fiber, indicated at D, which occupies the i entire space between the tubes A and B,

around a group of core strips, covering the same at the ends as well as around the outside and inside of the group. E represents the primary circuit winding, F the secondary circuit Winding. It will be understood that thc primary windin is in circuit with a source of current wit a suitable interrup'ter in the circuit, and that the secondary circuit is connected according to the service to be performed, none of these connections of either' circuit being shown.

Two principal advantages pertain to the employment of the flat metal core strips instead of the more usual bundle of round wires: First, the fiat metal strips being assembled all in parallel planes, as indicated. in the section, Fig. 2, there is no waste space, the minimum thickness of insulating material on the soft iron strip constituting the entire separation vbetween said metal strips, whereas, in the case of round Wire, the wires being separated from each other at their lines of nearest contact by the minimum thickness of material necessary for insulation, having much larger interspaces throughout the entire remainder of their circumference; secondly; substantially perfeet parallelism of all the lat'strips can be obtained, whereas in the case of a bundle of round wires it is practically impossible to effect their assemblage or aggregation lin the .form of an annular core withoutmanjy instances of obliquely or angularly placed wires crossing each other with the effect of partial opposition and neutralization of their respective lines of force, and consequent diminution of the resulting secondary current.

I claim l. An induction coil of which the core is annular in cross-section and composed of thin flat soft iron strips individually insulated from each other, in combination with concentric di-electric-containing tubes, in

Patented Mar. 2,1920.

whose annular interspace the core is situated.

2. In an induction coil such as defined in claim 1, the strips being embedded and completely inclosed in insulation occupying the remnants of the annular interspace between the di-electric tubes around the core strips therein.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 18th day of February, 1918.

RUDOLF ROSNER.4 

